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- /* GLIB - Library of useful routines for C programming
- * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-
- /*
- * Modified by the GLib Team and others 1997-2000. See the AUTHORS
- * file for a list of people on the GLib Team. See the ChangeLog
- * files for a list of changes. These files are distributed with
- * GLib at ftp://ftp.gtk.org/pub/gtk/.
- */
-
- #ifndef __G_THREAD_H__
- #define __G_THREAD_H__
-
- #include <glib/gerror.h>
- #include <glib/gtypes.h>
- #include <glib/gatomic.h> /* for g_atomic_pointer_get */
-
- G_BEGIN_DECLS
-
- /* GLib Thread support
- */
-
- extern GQuark g_thread_error_quark (void);
- #define G_THREAD_ERROR g_thread_error_quark ()
-
- typedef enum
- {
- G_THREAD_ERROR_AGAIN /* Resource temporarily unavailable */
- } GThreadError;
-
- typedef gpointer (*GThreadFunc) (gpointer data);
-
- typedef enum
- {
- G_THREAD_PRIORITY_LOW,
- G_THREAD_PRIORITY_NORMAL,
- G_THREAD_PRIORITY_HIGH,
- G_THREAD_PRIORITY_URGENT
- } GThreadPriority;
-
- typedef struct _GThread GThread;
- struct _GThread
- {
- /*< private >*/
- GThreadFunc func;
- gpointer data;
- gboolean joinable;
- GThreadPriority priority;
- };
-
- typedef struct _GMutex GMutex;
- typedef struct _GCond GCond;
- typedef struct _GPrivate GPrivate;
- typedef struct _GStaticPrivate GStaticPrivate;
-
- typedef struct _GThreadFunctions GThreadFunctions;
- struct _GThreadFunctions
- {
- GMutex* (*mutex_new) (void);
- void (*mutex_lock) (GMutex *mutex);
- gboolean (*mutex_trylock) (GMutex *mutex);
- void (*mutex_unlock) (GMutex *mutex);
- void (*mutex_free) (GMutex *mutex);
- GCond* (*cond_new) (void);
- void (*cond_signal) (GCond *cond);
- void (*cond_broadcast) (GCond *cond);
- void (*cond_wait) (GCond *cond,
- GMutex *mutex);
- gboolean (*cond_timed_wait) (GCond *cond,
- GMutex *mutex,
- GTimeVal *end_time);
- void (*cond_free) (GCond *cond);
- GPrivate* (*private_new) (GDestroyNotify destructor);
- gpointer (*private_get) (GPrivate *private_key);
- void (*private_set) (GPrivate *private_key,
- gpointer data);
- void (*thread_create) (GThreadFunc func,
- gpointer data,
- gulong stack_size,
- gboolean joinable,
- gboolean bound,
- GThreadPriority priority,
- gpointer thread,
- GError **error);
- void (*thread_yield) (void);
- void (*thread_join) (gpointer thread);
- void (*thread_exit) (void);
- void (*thread_set_priority)(gpointer thread,
- GThreadPriority priority);
- void (*thread_self) (gpointer thread);
- gboolean (*thread_equal) (gpointer thread1,
- gpointer thread2);
- };
-
- GLIB_VAR GThreadFunctions g_thread_functions_for_glib_use;
- GLIB_VAR gboolean g_thread_use_default_impl;
- GLIB_VAR gboolean g_threads_got_initialized;
-
- /* initializes the mutex/cond/private implementation for glib, might
- * only be called once, and must not be called directly or indirectly
- * from another glib-function, e.g. as a callback.
- */
- void g_thread_init (GThreadFunctions *vtable);
-
- /* Errorcheck mutexes. If you define G_ERRORCHECK_MUTEXES, then all
- * mutexes will check for re-locking and re-unlocking */
-
- /* Initialize thread system with errorcheck mutexes. vtable must be
- * NULL. Do not call directly. Use #define G_ERRORCHECK_MUTEXES
- * instead.
- */
- void g_thread_init_with_errorcheck_mutexes (GThreadFunctions* vtable);
-
- /* A random number to recognize debug calls to g_mutex_... */
- #define G_MUTEX_DEBUG_MAGIC 0xf8e18ad7
-
- #ifdef G_ERRORCHECK_MUTEXES
- #define g_thread_init(vtable) g_thread_init_with_errorcheck_mutexes (vtable)
- #endif
-
- /* internal function for fallback static mutex implementation */
- GMutex* g_static_mutex_get_mutex_impl (GMutex **mutex);
-
- #define g_static_mutex_get_mutex_impl_shortcut(mutex) \
- (g_atomic_pointer_get ((gpointer*)mutex) ? *(mutex) : \
- g_static_mutex_get_mutex_impl (mutex))
-
- /* shorthands for conditional and unconditional function calls */
-
- #define G_THREAD_UF(op, arglist) \
- (*g_thread_functions_for_glib_use . op) arglist
- #define G_THREAD_CF(op, fail, arg) \
- (g_thread_supported () ? G_THREAD_UF (op, arg) : (fail))
- #define G_THREAD_ECF(op, fail, mutex, type) \
- (g_thread_supported () ? ((type(*)(GMutex*, gulong, gchar*)) \
- (*g_thread_functions_for_glib_use . op)) \
- (mutex, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : (fail))
-
- #ifndef G_ERRORCHECK_MUTEXES
- # define g_mutex_lock(mutex) \
- G_THREAD_CF (mutex_lock, (void)0, (mutex))
- # define g_mutex_trylock(mutex) \
- G_THREAD_CF (mutex_trylock, TRUE, (mutex))
- # define g_mutex_unlock(mutex) \
- G_THREAD_CF (mutex_unlock, (void)0, (mutex))
- # define g_mutex_free(mutex) \
- G_THREAD_CF (mutex_free, (void)0, (mutex))
- # define g_cond_wait(cond, mutex) \
- G_THREAD_CF (cond_wait, (void)0, (cond, mutex))
- # define g_cond_timed_wait(cond, mutex, abs_time) \
- G_THREAD_CF (cond_timed_wait, TRUE, (cond, mutex, abs_time))
- #else /* G_ERRORCHECK_MUTEXES */
- # define g_mutex_lock(mutex) \
- G_THREAD_ECF (mutex_lock, (void)0, (mutex), void)
- # define g_mutex_trylock(mutex) \
- G_THREAD_ECF (mutex_trylock, TRUE, (mutex), gboolean)
- # define g_mutex_unlock(mutex) \
- G_THREAD_ECF (mutex_unlock, (void)0, (mutex), void)
- # define g_mutex_free(mutex) \
- G_THREAD_ECF (mutex_free, (void)0, (mutex), void)
- # define g_cond_wait(cond, mutex) \
- (g_thread_supported () ? ((void(*)(GCond*, GMutex*, gulong, gchar*))\
- g_thread_functions_for_glib_use.cond_wait) \
- (cond, mutex, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : (void) 0)
- # define g_cond_timed_wait(cond, mutex, abs_time) \
- (g_thread_supported () ? \
- ((gboolean(*)(GCond*, GMutex*, GTimeVal*, gulong, gchar*)) \
- g_thread_functions_for_glib_use.cond_timed_wait) \
- (cond, mutex, abs_time, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : TRUE)
- #endif /* G_ERRORCHECK_MUTEXES */
-
- #define g_thread_supported() (g_threads_got_initialized)
- #define g_mutex_new() G_THREAD_UF (mutex_new, ())
- #define g_cond_new() G_THREAD_UF (cond_new, ())
- #define g_cond_signal(cond) G_THREAD_CF (cond_signal, (void)0, (cond))
- #define g_cond_broadcast(cond) G_THREAD_CF (cond_broadcast, (void)0, (cond))
- #define g_cond_free(cond) G_THREAD_CF (cond_free, (void)0, (cond))
- #define g_private_new(destructor) G_THREAD_UF (private_new, (destructor))
- #define g_private_get(private_key) G_THREAD_CF (private_get, \
- ((gpointer)private_key), \
- (private_key))
- #define g_private_set(private_key, value) G_THREAD_CF (private_set, \
- (void) (private_key = \
- (GPrivate*) (value)), \
- (private_key, value))
- #define g_thread_yield() G_THREAD_CF (thread_yield, (void)0, ())
-
- #define g_thread_create(func, data, joinable, error) \
- (g_thread_create_full (func, data, 0, joinable, FALSE, \
- G_THREAD_PRIORITY_NORMAL, error))
-
- GThread* g_thread_create_full (GThreadFunc func,
- gpointer data,
- gulong stack_size,
- gboolean joinable,
- gboolean bound,
- GThreadPriority priority,
- GError **error);
- GThread* g_thread_self (void);
- void g_thread_exit (gpointer retval);
- gpointer g_thread_join (GThread *thread);
-
- void g_thread_set_priority (GThread *thread,
- GThreadPriority priority);
-
- /* GStaticMutexes can be statically initialized with the value
- * G_STATIC_MUTEX_INIT, and then they can directly be used, that is
- * much easier, than having to explicitly allocate the mutex before
- * use
- */
- #define g_static_mutex_lock(mutex) \
- g_mutex_lock (g_static_mutex_get_mutex (mutex))
- #define g_static_mutex_trylock(mutex) \
- g_mutex_trylock (g_static_mutex_get_mutex (mutex))
- #define g_static_mutex_unlock(mutex) \
- g_mutex_unlock (g_static_mutex_get_mutex (mutex))
- void g_static_mutex_init (GStaticMutex *mutex);
- void g_static_mutex_free (GStaticMutex *mutex);
-
- struct _GStaticPrivate
- {
- /*< private >*/
- guint index;
- };
- #define G_STATIC_PRIVATE_INIT { 0 }
- void g_static_private_init (GStaticPrivate *private_key);
- gpointer g_static_private_get (GStaticPrivate *private_key);
- void g_static_private_set (GStaticPrivate *private_key,
- gpointer data,
- GDestroyNotify notify);
- void g_static_private_free (GStaticPrivate *private_key);
-
- typedef struct _GStaticRecMutex GStaticRecMutex;
- struct _GStaticRecMutex
- {
- /*< private >*/
- GStaticMutex mutex;
- guint depth;
- GSystemThread owner;
- };
-
- #define G_STATIC_REC_MUTEX_INIT { G_STATIC_MUTEX_INIT }
- void g_static_rec_mutex_init (GStaticRecMutex *mutex);
- void g_static_rec_mutex_lock (GStaticRecMutex *mutex);
- gboolean g_static_rec_mutex_trylock (GStaticRecMutex *mutex);
- void g_static_rec_mutex_unlock (GStaticRecMutex *mutex);
- void g_static_rec_mutex_lock_full (GStaticRecMutex *mutex,
- guint depth);
- guint g_static_rec_mutex_unlock_full (GStaticRecMutex *mutex);
- void g_static_rec_mutex_free (GStaticRecMutex *mutex);
-
- typedef struct _GStaticRWLock GStaticRWLock;
- struct _GStaticRWLock
- {
- /*< private >*/
- GStaticMutex mutex;
- GCond *read_cond;
- GCond *write_cond;
- guint read_counter;
- gboolean have_writer;
- guint want_to_read;
- guint want_to_write;
- };
-
- #define G_STATIC_RW_LOCK_INIT { G_STATIC_MUTEX_INIT, NULL, NULL, 0, FALSE, 0, 0 }
-
- void g_static_rw_lock_init (GStaticRWLock* lock);
- void g_static_rw_lock_reader_lock (GStaticRWLock* lock);
- gboolean g_static_rw_lock_reader_trylock (GStaticRWLock* lock);
- void g_static_rw_lock_reader_unlock (GStaticRWLock* lock);
- void g_static_rw_lock_writer_lock (GStaticRWLock* lock);
- gboolean g_static_rw_lock_writer_trylock (GStaticRWLock* lock);
- void g_static_rw_lock_writer_unlock (GStaticRWLock* lock);
- void g_static_rw_lock_free (GStaticRWLock* lock);
-
- typedef enum
- {
- G_ONCE_STATUS_NOTCALLED,
- G_ONCE_STATUS_PROGRESS,
- G_ONCE_STATUS_READY
- } GOnceStatus;
-
- typedef struct _GOnce GOnce;
- struct _GOnce
- {
- volatile GOnceStatus status;
- volatile gpointer retval;
- };
-
- #define G_ONCE_INIT { G_ONCE_STATUS_NOTCALLED, NULL }
-
- gpointer g_once_impl (GOnce *once, GThreadFunc func, gpointer arg);
-
- #ifdef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
- # define g_once(once, func, arg) g_once_impl ((once), (func), (arg))
- #else /* !G_ATOMIC_OP_MEMORY_BARRIER_NEEDED*/
- # define g_once(once, func, arg) \
- (((once)->status == G_ONCE_STATUS_READY) ? \
- (once)->retval : \
- g_once_impl ((once), (func), (arg)))
- #endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
-
- /* these are some convenience macros that expand to nothing if GLib
- * was configured with --disable-threads. for using StaticMutexes,
- * you define them with G_LOCK_DEFINE_STATIC (name) or G_LOCK_DEFINE (name)
- * if you need to export the mutex. With G_LOCK_EXTERN (name) you can
- * declare such an globally defined lock. name is a unique identifier
- * for the protected varibale or code portion. locking, testing and
- * unlocking of such mutexes can be done with G_LOCK(), G_UNLOCK() and
- * G_TRYLOCK() respectively.
- */
- extern void glib_dummy_decl (void);
- #define G_LOCK_NAME(name) g__ ## name ## _lock
- #ifdef G_THREADS_ENABLED
- # define G_LOCK_DEFINE_STATIC(name) static G_LOCK_DEFINE (name)
- # define G_LOCK_DEFINE(name) \
- GStaticMutex G_LOCK_NAME (name) = G_STATIC_MUTEX_INIT
- # define G_LOCK_EXTERN(name) extern GStaticMutex G_LOCK_NAME (name)
-
- # ifdef G_DEBUG_LOCKS
- # define G_LOCK(name) G_STMT_START{ \
- g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
- "file %s: line %d (%s): locking: %s ", \
- __FILE__, __LINE__, G_GNUC_PRETTY_FUNCTION, \
- #name); \
- g_static_mutex_lock (&G_LOCK_NAME (name)); \
- }G_STMT_END
- # define G_UNLOCK(name) G_STMT_START{ \
- g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
- "file %s: line %d (%s): unlocking: %s ", \
- __FILE__, __LINE__, G_GNUC_PRETTY_FUNCTION, \
- #name); \
- g_static_mutex_unlock (&G_LOCK_NAME (name)); \
- }G_STMT_END
- # define G_TRYLOCK(name) \
- (g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
- "file %s: line %d (%s): try locking: %s ", \
- __FILE__, __LINE__, G_GNUC_PRETTY_FUNCTION, \
- #name), g_static_mutex_trylock (&G_LOCK_NAME (name)))
- # else /* !G_DEBUG_LOCKS */
- # define G_LOCK(name) g_static_mutex_lock (&G_LOCK_NAME (name))
- # define G_UNLOCK(name) g_static_mutex_unlock (&G_LOCK_NAME (name))
- # define G_TRYLOCK(name) g_static_mutex_trylock (&G_LOCK_NAME (name))
- # endif /* !G_DEBUG_LOCKS */
- #else /* !G_THREADS_ENABLED */
- # define G_LOCK_DEFINE_STATIC(name) extern void glib_dummy_decl (void)
- # define G_LOCK_DEFINE(name) extern void glib_dummy_decl (void)
- # define G_LOCK_EXTERN(name) extern void glib_dummy_decl (void)
- # define G_LOCK(name)
- # define G_UNLOCK(name)
- # define G_TRYLOCK(name) (TRUE)
- #endif /* !G_THREADS_ENABLED */
-
- G_END_DECLS
-
- #endif /* __G_THREAD_H__ */
-
-